[ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 49.033567][ T4820] systemd-udevd (4820) used greatest stack depth: 22272 bytes left [ 49.066956][ T4793] systemd-udevd (4793) used greatest stack depth: 21456 bytes left Warning: Permanently added '10.128.10.18' (ECDSA) to the list of known hosts. executing program [ 55.125705][ T6795] general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] PREEMPT SMP KASAN [ 55.137709][ T6795] KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf] [ 55.146099][ T6795] CPU: 1 PID: 6795 Comm: syz-executor426 Not tainted 5.7.0-rc7-next-20200529-syzkaller #0 [ 55.155960][ T6795] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.166000][ T6795] RIP: 0010:__tipc_sendstream+0xbc1/0x11d0 [ 55.171797][ T6795] Code: 00 00 00 00 48 39 5c 24 28 48 0f 44 d8 e8 87 1a cf f9 48 b8 00 00 00 00 00 fc ff df 48 8d bb c8 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e2 04 00 00 48 8b 9b c8 00 00 00 48 b8 00 00 00 [ 55.191500][ T6795] RSP: 0018:ffffc900015f7808 EFLAGS: 00010202 [ 55.198585][ T6795] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87a3e0d0 [ 55.206528][ T6795] RDX: 0000000000000019 RSI: ffffffff87a3e119 RDI: 00000000000000c8 [ 55.214484][ T6795] RBP: ffff888094732d40 R08: ffff8880963ae4c0 R09: 0000000000000001 [ 55.222430][ T6795] R10: ffffffff8c588adf R11: fffffbfff18b115b R12: ffff88809473327e [ 55.230384][ T6795] R13: 0000000000000000 R14: ffff8880a2bcf540 R15: 0000000000000000 [ 55.238342][ T6795] FS: 00000000012a0880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 55.247351][ T6795] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.253918][ T6795] CR2: 0000000020236fc8 CR3: 0000000090115000 CR4: 00000000001406e0 [ 55.261877][ T6795] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 55.269834][ T6795] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 55.277792][ T6795] Call Trace: [ 55.281104][ T6795] ? tipc_connect+0xa70/0xa70 [ 55.285765][ T6795] ? prepare_to_wait_exclusive+0x2c0/0x2c0 [ 55.291552][ T6795] ? __local_bh_enable_ip+0x159/0x270 [ 55.297158][ T6795] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 55.303120][ T6795] ? lock_sock_nested+0x94/0x110 [ 55.308038][ T6795] ? lock_sock_nested+0x94/0x110 [ 55.312959][ T6795] tipc_sendstream+0x4c/0x70 [ 55.317531][ T6795] tipc_send_packet+0x3c/0x60 [ 55.322195][ T6795] ? tipc_sendstream+0x70/0x70 [ 55.326935][ T6795] sock_sendmsg+0xcf/0x120 [ 55.331327][ T6795] ____sys_sendmsg+0x32f/0x810 [ 55.336063][ T6795] ? kernel_sendmsg+0x50/0x50 [ 55.340723][ T6795] ? __lock_acquire+0x2224/0x48b0 [ 55.345720][ T6795] ___sys_sendmsg+0x100/0x170 [ 55.350369][ T6795] ? sendmsg_copy_msghdr+0x70/0x70 [ 55.355467][ T6795] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 55.361608][ T6795] ? find_held_lock+0x2d/0x110 [ 55.366349][ T6795] ? __might_fault+0x11f/0x1d0 [ 55.371102][ T6795] ? find_held_lock+0x2d/0x110 [ 55.375837][ T6795] ? lock_downgrade+0x840/0x840 [ 55.380683][ T6795] ? do_huge_pmd_anonymous_page+0xce3/0x1c80 [ 55.386645][ T6795] __sys_sendmmsg+0x195/0x480 [ 55.391297][ T6795] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 55.396297][ T6795] ? exc_page_fault+0x5f2/0x14a0 [ 55.401274][ T6795] ? check_preemption_disabled+0x38/0x220 [ 55.406979][ T6795] ? prepare_exit_to_usermode+0xa/0x30 [ 55.412464][ T6795] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 55.418464][ T6795] ? check_preemption_disabled+0x38/0x220 [ 55.424160][ T6795] ? do_syscall_64+0x17/0xe0 [ 55.428725][ T6795] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 55.434242][ T6795] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 55.440280][ T6795] __x64_sys_sendmmsg+0x99/0x100 [ 55.445197][ T6795] do_syscall_64+0x60/0xe0 [ 55.449616][ T6795] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.455491][ T6795] RIP: 0033:0x4401e9 [ 55.468659][ T6795] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 55.488238][ T6795] RSP: 002b:00007ffd3d780d58 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 55.496628][ T6795] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401e9 [ 55.504768][ T6795] RDX: 04924924924926c8 RSI: 0000000020236fc8 RDI: 0000000000000004 [ 55.512718][ T6795] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 55.520774][ T6795] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a70 [ 55.528720][ T6795] R13: 0000000000401b00 R14: 0000000000000000 R15: 0000000000000000 [ 55.536670][ T6795] Modules linked in: [ 55.547908][ T6795] ---[ end trace 275d439b34ba6e14 ]--- [ 55.553385][ T6795] RIP: 0010:__tipc_sendstream+0xbc1/0x11d0 [ 55.568202][ T6795] Code: 00 00 00 00 48 39 5c 24 28 48 0f 44 d8 e8 87 1a cf f9 48 b8 00 00 00 00 00 fc ff df 48 8d bb c8 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e2 04 00 00 48 8b 9b c8 00 00 00 48 b8 00 00 00 [ 55.588724][ T6795] RSP: 0018:ffffc900015f7808 EFLAGS: 00010202 [ 55.594798][ T6795] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87a3e0d0 [ 55.603796][ T6795] RDX: 0000000000000019 RSI: ffffffff87a3e119 RDI: 00000000000000c8 [ 55.612176][ T6795] RBP: ffff888094732d40 R08: ffff8880963ae4c0 R09: 0000000000000001 [ 55.620482][ T6795] R10: ffffffff8c588adf R11: fffffbfff18b115b R12: ffff88809473327e [ 55.628903][ T6795] R13: 0000000000000000 R14: ffff8880a2bcf540 R15: 0000000000000000 [ 55.636883][ T6795] FS: 00000000012a0880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 55.646376][ T6795] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.653437][ T6795] CR2: 00007fb95a30c000 CR3: 0000000090115000 CR4: 00000000001406e0 [ 55.661829][ T6795] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 55.670131][ T6795] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 55.683155][ T6795] Kernel panic - not syncing: Fatal exception [ 55.690613][ T6795] Kernel Offset: disabled [ 55.694926][ T6795] Rebooting in 86400 seconds..